Cisco IOS Software contains a vulnerability that could allow a local attacker to cause a denial of service condition. Updates are available.

Description

A vulnerability in the crypto engine process of Cisco IOS Software when
running on Cisco Aggregation Services Router Route Processor 2 could
allow an authenticated, local attacker to cause a crash of the route
processor.

The vulnerability is due to a flaw in memory
management. An attacker could exploit this vulnerability by creating
many tunnels to the router and viewing the encryption statistics. An
exploit could allow the attacker to cause the route processor to crash.

Cisco has confirmed the vulnerability in a security notice and software updates are available.

Warning Indicators

At the time this alert was first published, Cisco IOS Software Releases 15.3(1)T and prior were vulnerable. Later releases of Cisco IOS Software may also be affected.

IntelliShield Analysis

To exploit this vulnerability, the attacker must have local access to a targeted system. This access requirement limits the possibility of a successful exploit.

Customers are advised to review the bug report in the "Vendor Announcements" section for a current list of affected versions.

Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.

A local attacker could exploit this vulnerability to cause the route processor on a targeted device to crash, resulting in a denial of service (DoS) condition.

Technical Information

The vulnerability is due to improper memory management by the crypto engine process of the affected software.

A local attacker could exploit this vulnerability by creating many tunnels to an affected device and viewing the encryption statistics. Successful exploitation could cause the route processor on the affected device to crash, resulting in a DoS condition.

Safeguards

Administrators are advised to apply the appropriate updates.

Administrators are advised to allow only privileged users to access administration or management systems.

Administrators are advised to monitor affected systems.

Patches/Software

Cisco customers with active contracts should contact their Cisco support team for assistance in upgrading to a software version that includes fixes for this vulnerability. Cisco customers without contracts may contact the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via e-mail at tac@cisco.com for assistance.

The security vulnerability applies to the following combinations of products.

Primary Products:

Cisco

IOS

15.3S 15.3(1)S, 15.3(1)S1, 15.3(1)S2, 15.3(2)S | 15.3T 15.3(1)T

Associated Products:

N/A

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LEGAL DISCLAIMER
The urgency and severity ratings of this alert are not tailored to individual users; users may value alerts differently based upon their network configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.